A multi-biomarker approach for the early assessment of the toxicity of hospital wastewater using the freshwater organism Daphnia magna

Afsa, Sabrine; Vieira, Madalena; Nogueira, Ana Filipa; Mansour, Hédi Ben; Nunes, Bruno

doi:10.1007/s11356-021-16977-7

Cited by 3 publications

(1 citation statement)

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“…The incorrect disposal of these compounds and the excretion by animals and humans of up to 90% of the administered drugs represent a threat to various environments, since their active principles are constantly found in small amounts in drinking water, wastewater, and surface water, interacting with biological systems, poisoning animals, and harming human health [13,14]. Drugs from the therapeutic classes of analgesics/nonsteroidal anti-inflammatory drugs, antibiotics, beta-blockers, and psychiatric drugs have been extensively detected worldwide at moderately high concentrations (up to hundreds of µg) [15]. Since the COVID-19 outbreak, approximately 70% of hospitalized patients have been treated with antibiotics.…”

Section: Organohalidesmentioning

confidence: 99%

Nanoparticles of the Perovskite-Structure CaTiO3 System: The Synthesis, Characterization, and Evaluation of Its Photocatalytic Capacity to Degrade Emerging Pollutants

Cerón-Urbano,

Aguilar,

Diosa

et al. 2023

Nanomaterials

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In this research work, the photocatalytic capacity shown by the nanoparticles of the CaTiO3 system was evaluated to degrade two pollutants of emerging concern, namely methyl orange (MO)—considered an organic contaminating substance of the textile industry that is non-biodegradable when dissolved in water—and levofloxacin (LVF), an antibiotic widely used in the treatment of infectious diseases that is released mostly to the environment in its original chemical form. The synthesis process used to obtain these powders was the polymeric precursor method (Pechini), at a temperature of 700 °C for 6 h. The characterization of the obtained oxide nanoparticles of interest revealed the presence of a majority perovskite-type phase with an orthorhombic Pbnm structure and a minority rutile-type TiO2 phase, with a P42/mnm structure and a primary particle size <100nm. The adsorption–desorption isotherms of the synthesized solids had H3-type hysteresis loops, characteristic of mesoporous solids, with a BET surface area of 10.01m2/g. The Raman and FTIR spectroscopy results made it possible to identify the characteristic vibrations of the synthesized system and the characteristic deformations of the perovskite structure, reiterating the results obtained from the XRD analysis. Furthermore, a bandgap energy of ~3.4eV and characteristic emissions in the violet (437 nm/2.8 eV) and orange (611 nm/2.03 eV) were determined for excitation lengths of 250 nm and 325 nm, respectively, showing that these systems have a strong emission in the visible light region and allowing their use in photocatalytic activity to be potentialized. The powders obtained were studied for their photocatalytic capacity to degrade methyl orange (MO) and levofloxacin (LVF), dissolved in water. To quantify the coloring concentration, UV–visible spectroscopy was used considering the variation in the intensity of the characteristic of the greatest absorption, which correlated with the change in the concentration of the contaminant in the solution. The results showed that after irradiation with ultraviolet light, the degradation of the contaminants MO and LVF was 79.4% and 98.1% with concentrations of 5 g/L and 10 g/L, respectively.

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Section: Organohalidesmentioning

confidence: 99%